diff --git a/Sub-GHz/ReadMe.md b/Sub-GHz/ReadMe.md index 618bfb0d..1c38c755 100644 --- a/Sub-GHz/ReadMe.md +++ b/Sub-GHz/ReadMe.md @@ -33,16 +33,17 @@ Please understand what you're doing if trying to break out of official frequenci Here's what the [manufacturer of the chip (CC1101) says](https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1120743/cc1101-operation-outside-datasheet-frequencies/4154832) about going outside the limits: ``` -The frequency range of the chip is always tested in the verification tests and there is always some design margin included before -the VCO and/or PLL has problems operating for a specified frequency range. Working outside the frequency range can cause issues -with the VCO and/or PLL and/or divider not operating correctly. If the VCO is operating outside it's standard frequency range, -there are risks of unwanted emissions and no oscillation. The PLL can also fail to lock if operating outside it's standard -frequency range and will still apply power to the antenna. +The frequency range of the chip is always tested in the verification tests and there is always some design margin +included before the VCO and/or PLL has problems operating for a specified frequency range. Working outside the +frequency range can cause issues with the VCO and/or PLL and/or divider not operating correctly. If the VCO is +operating outside it's standard frequency range, there are risks of unwanted emissions and no oscillation. The PLL +can also fail to lock if operating outside it's standard frequency range and will still apply power to the antenna. -Risks with antenna mismatch are increased harmonics, reduced output power and increased current consumption. Generally, the antenna -mismatch can be large and the output stage will not be damaged when presented with a large mismatch for short periods of time. -However, if the antenna mismatch is very poor for long periods of time, then this can effect the longevity of the chip especially -if further stressed with maximum voltage and maximum temperature. Recommend keeping VSWR better than 5:1 for worst case scenarios. +Risks with antenna mismatch are increased harmonics, reduced output power and increased current consumption. +Generally, the antenna mismatch can be large and the output stage will not be damaged when presented with a large +mismatch for short periods of time. However, if the antenna mismatch is very poor for long periods of time, then +this can effect the longevity of the chip especially if further stressed with maximum voltage and maximum temperature. +Recommend keeping VSWR better than 5:1 for worst case scenarios. ``` You'll need to edit some code and recompile if you want to break outside of the officially supported frequencies. [Proceed with caution.](https://github.com/UberGuidoZ/Flipper/blob/main/Sub-GHz/Restaurant_Pagers/SubGHz_changes.md) @@ -98,4 +99,4 @@ So, here it is. All donations of *any* size are humbly appreciated.
![Flipper_Clap](https://user-images.githubusercontent.com/57457139/183561789-2e853ede-8ef7-41e8-a67c-716225177e5d.jpg) ![Flipper_OMG](https://user-images.githubusercontent.com/57457139/183561787-e21bdc1e-b316-4e67-b327-5129503d0313.jpg) Donations will be used for hardware (and maybe caffeine) to further testing!
-![UberGuidoZ](https://cdn.discordapp.com/emojis/1000632669622767686.gif) \ No newline at end of file +![UberGuidoZ](https://cdn.discordapp.com/emojis/1000632669622767686.gif)